ripidolite
noun
ri·pid·o·lite
rə̇ˈpidᵊlˌīt,
rīˈp-
plural -s
: a mineral (Mg,Fe)9Al6Si5O20(OH)16 consisting of a basic magnesium iron aluminum silicate of the chlorite group
Word History
Etymology
German ripidolith, irregular from rhipid- + -lith -lite